Release characteristics and mechanisms of sediment phosphorus in contaminated and uncontaminated rivers: A case study in South China

Phosphorus (P) cycling present in sediments associated with iron (Fe), manganese (Mn) and sulfur (S) geochemical processes may cause secondary pollution in overlying water. Understanding the mechanisms of P release from sediments should help to restore water quality. This study used the diffusive gr...

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Bibliographic Details
Published in:Environmental pollution (1987) 2021-01, Vol.268 (Pt A), p.115749, Article 115749
Main Authors: Li, Rui, Gao, Lei, Wu, Qirui, Liang, Zuobing, Hou, Lei, Yang, Zhigang, Chen, Jianyao, Jiang, Tao, Zhu, Aiping, Li, Manzi
Format: Article
Language:English
Subjects:
China
Diffusive flux
Diffusive gradients in thin film
Environmental Monitoring
Fe & Mn–P coupling
Geologic Sediments
P legacy
Phosphorus - analysis
Rivers
Sediment
Sulfate reduction
Water Pollutants, Chemical - analysis
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Summary:Phosphorus (P) cycling present in sediments associated with iron (Fe), manganese (Mn) and sulfur (S) geochemical processes may cause secondary pollution in overlying water. Understanding the mechanisms of P release from sediments should help to restore water quality. This study used the diffusive gradients in thin film (DGT) technique to investigate the seasonal variation in the lability, remobilization mechanisms, and release characteristics of sediment P in the uncontaminated Xizhi River and the severely contaminated Danshui River, South China. P accumulation in sediments contributed to higher DGT-labile P concentrations in contaminated reaches, and the highest labile P concentrations were generally observed in summer season at each site. The significant positive relationships (p 
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2020.115749